The Government has recently accepted the Low Pay Commission's (LPC) recommendations for changes to wages for apprentice minimum wage rates, along with those for the National Minimum Wage and National Living Wage. This will include an increase in the apprentice rate from £3.90 per hour to £4.15 per hour. All revised wages will apply from April 2020.
Apprentice minimum wage rate will continue to apply to those aged under 19, or aged 19 or over and in the first year of their apprenticeship. However, the National Minimum Wage for their age applies to those 19 or over and who have completed the first year of their apprenticeship.
A summary of the LPC's recommendations can be found at https://www.gov.uk/government/publications/low-pay-commission-2019-summary-of-findings and the full report at https://www.gov.uk/government/publications/low-pay-commission-report-2019.
The Apprenticeship Pay Survey for 2018-19 was also published last week. Which you can find here: https://www.gov.uk/government/publications/apprenticeship-pay-survey-2018-to-2019.